Abstract: An apparatus and method for selecting an optimum printed circuit board in terms of its intended use before placement of components on the printed circuit board, information about components to be mounted on the printed circuit board, and an outer size of the printed circuit board is provided. The apparatus includes an input section for inputting information, a storing section for storing information, an arithmetic section for performing an arithmetic calculation using the information stored in the storing section, a display section, and a control section. By deriving an index in the arithmetic section, selection of the optimum printed circuit board can be accomplished.

Abstract: A hydrostatic gas bearing having particular damping characteristics is provided. The hydrostatic gas bearing is of the orifice type having an air groove communicated with a gas injection port, wherein when a bearing clearance is denoted by h and a depth of the air groove by g, h is not larger than 5 &mgr;m and g/h is not smaller than 5. The material of the guide, slider and orifice constituting the bearing is alumina, silicon carbide, silicon nitride, Sialon, cordierite, or a composite ceramic including any one of them, as a main component.

Abstract: The present invention has its object to provide a hydrostatic gas bearing excellent in a vibration-damping characteristic. The hydrostatic gas bearing is provided with a gas ejecting equipments composed of a cylindrical fine hole having a diameter of not less than 0.04 mm and not more than 0.4 mm,wherein a helium gas is ejected through the cylindrical fine hole. The cylindrical hole has a diameter D and a length L, and in the case where a relationship of D4/L is not more than 2×10−4 mm3 is established, the hydrostatic gas bearing excellent in the vibration-damping characteristic is specifically realized.

Abstract: An apparatus and method for selecting an optimum printed circuit board in terms of its intended use before placement of components on the printed circuit board, information about components to be mounted on the printed circuit board, and an outer size of the printed circuit board is provided. The apparatus includes an input section for inputting information, a storing section for storing information, an arithmetic section for performing an arithmetic calculation using the information stored in the storing section, a display section, and a control section. By deriving an index in the arithmetic section, selection of the optimum printed circuit board can be accomplished.

Abstract: A connecting device of a soil removing member for an excavator is used for connecting two soil removing members, wherein a helical ejecting blade is attached on an outer periphery of a rotational shaft. The rotational shaft in one soil removing member is connected to another rotational shaft of another soil removing member in accordance with excavation. The connecting member is basically formed of an inserting member disposed at one end of the rotational shaft, and a receiving member provided at the other end of the rotational shaft.

Abstract: A suction pump draws by suction an atmosphere sample into a gas component collecting section to collect a gas component in the atmosphere into an absorption liquid 48a and thereafter collect a particle component into absorption liquids. A liquid transfer pump transfers the absorption liquids to a measurement standby vessel to make them stand by. When measurement of the absorption liquid is completed, a liquid transfer on-off valve opens to transfer the absorption liquids to an analysis apparatus to make it execute measurement. A liquid transfer pump supplies new absorption liquid when a gas component collecting use absorption liquid vessel and first and second stage impinger sections are emptied. By thus executing collecting, condensation and measurement in parallel by the gas component and the particle component, a state-by-state analysis of the impurities in the atmosphere can be automatically executed in real time.

Abstract: A high density magneto-optical recording medium utilizing a polycrystalline garnet two-layer film. The film thickness of an under layer of the garnet polycrystal on a glass substrate is made 100 nm or less, and a crystal grain diameter of a recording layer formed thereon is made 0.1 .mu.m or less. Furthermore, the under layer is demagnetized at room temperature. With this, a bit having a regular shape can be written, thus reducing medium noise by a large margin.

Abstract: A hammer device is coupled to an outer portion of a handle, an operating portion is attached to the other portion of the handle, a holding section is attached to one side of the operating portion, and at the same time, a pair of excavators is rotatably attached to an outer portion of the holding section to conduct a bumping operation and opening and closing operations upon transmission from the operating portion. By this, burdens imposed on workers are reduced, at the same time, security of work is assured and time required for completion of works can be greatly shortened and reduced.

Abstract: Rare earth magnets comprising 12 to 20 at % R (where R denotes rare earth elements including at least one selected from neodymium and praseodymium) and 2 to 10 at % boron, with the remainder being TM (where TM=Fe.sub.1-x Co.sub.x (0.ltoreq.x.ltoreq.0.4)) and unavoidable impurities, wherein 50 to 100 vol % of the magnet is formed of recrystallization grains of R.sub.2 Fe.sub.14 B intermetallic compound having a tetragonal crystal structure with an average grain size of 1 to 100 .mu.m and an induced anisotropy P of 0.1 or more (where P=(Br(.parallel.)-Br(.perp.))/(Br(.parallel.)+Br(.perp.)), Br(.parallel.) being residual magnetic flux density along the easy magnetization axis and Br(.perp.) being residual magnetic flux density perpendicular to the easy magnetization axis), and the method of producing the rare earth magnets.

Abstract: A charge transfer complex formed between a benzoquinone derivative represented by formula ##STR1## wherein at least one of the rings A and B represents a heterocyclic ring as defined in the specification, and an electron donor, and a salt of an anion or anion radical of the benzoquinone derivative of the above formula are disclosed. The charge transfer complex and the salt are useful as electronic materials.

Abstract: A thiadiazolo pyrazine compound and a method of using such a compound as an organoelectric material in a semiconductor.

Abstract: A powder X formed by quenching a molten alloy containing, on an atomic percent basis, at least 8%, but less than 13%, of a rare earth component consisting mainly of one or both of neodymium and praseodymium, and 4 to 8% of boron, the balance of its composition being iron and unavoidable impurities, and a powder Y formed by quenching a molten alloy containing, on an atomic percent basis, 13 to 20% of a rare earth component consisting mainly of one or both of neodymium and praseodymium, and 4 to 8% of boron, the balance of its composition being iron and unavoidable impurities, are mixed to prepare a mixture containing 5 to 50% by volume of powder Y. The mixture is subjected to heat and pressure to make a rare earth magnet containing, on an atomic percent basis, 9 to 14% of a rare earth component consisting mainly of one or both of neodymium and praseodymium, and 4 to 8% of boron, the balance of its composition being iron and unavoidable impurities.

Abstract: A novel tetracyanoanthraquinodimethane derivative and a process for producing it are disclosed, the tetracyanoanthraquinodimethane derivative being represented by formula: ##STR1## wherein R, m, and n are as defined in the specification. A solid charge transfer complex of the tetracyanoanthraquinodimethane derivative with an electron donating compound and a process for producing it are also disclosed.

Abstract: Rare-earth alloy anisotropic powders consist of, in atomic percent, over 12 percent and not more than 20 percent of R (R is at least one on neodymium and praseodymium or at least one of them and or more rare-earth elements), not less than 4 percent and not more than 10 percent of boron, not less than 0.05 percent and not more than 5 percent of copper and the rest that consists of iron and unavoidable impurities. Up to 20 percent of the iron contained is replaceable with cobalt. The alloy powders are made up of flat crystal grains having mean thickness h (the shortest measure), d not smaller than 0.01 .mu.m and not larger than 0.5 .mu.m and ratio d/h not smaller than 2, where d is the means measure of the grains taken at right angles to the widthwide direction thereof, and the alloy powders are magnetically anisotropic.

Abstract: A novel tetracyanoanthraquinodimethane derivative and a process for producing it are disclosed, the tetracyanoanthraquinodimethane derivative being represented by formula: ##STR1## wherein R, m, and n are as defined in the specification. A solid charge transfer complex of the tetracyanoanthraquinodimethane derivative with an electron donating compound and a process for producing it are also disclosed.

Abstract: A charge transfer complex formed between a benzoquinone derivative represented by formula ##STR1## wherein at least one of the rings A and B represents a heterocyclic ring as defined in the specification, and an electron donor, and a salt of an anion or anion radical of the benzoquinone derivative of the above formula are disclosed. The charge transfer complex and the salt are useful as electronic materials.

Abstract: The compound bis[1,2,5]thiadiazolo[3,4-b:3',4'-e]pyrazine represented by the formula (I): ##STR1## a process for preparing this compound, a method of using this compound and novel intermediate products.

Abstract: A rotary gad for a ground drill includes an elongated front body having a front end and a rear end with front spiral blades being disposed on the outside of the front body. The front body has an elongated front axial passage, and a front core rod is disposed in the front axial passage. The front body is rotatable about the front core rod. The front core rod has a front end and a rear end. An elongated rear body has a similar construction and a pushing section is provided on a rear axial passage in the rear body. The pushing section has a front side and a rear side. A rear ball element is disposed between the rear side of the pushing section and the front end of a rear core rod, and a front ball element is disposed between the front side of the pushing section and the rear end of the front core rod. Coupling means couple the front and rear bodies to provide for rotation of the front and rear bodies in opposite directions about the front and rear core rods.